Ending: Perhaps the protagonist succeeds but at a personal cost, or they find a way to give the fallen peace, or they have to become a fallen themselves. Leave it open-ended or satisfying based on the intended message.
I need to establish the setting first. Let's go with a fantasy world to allow for creativity. Maybe a realm where when warriors die, they become spirits that mods (maybe a mystical order) manage. The story could revolve around a protagonist who is part of this mod group, tasked with preventing the fallen from causing chaos. modsallthefallen
Need to check for consistency and make sure the mods' abilities are established early on. Avoid plot holes about how the fallen exist and why the mods need to handle them. Maybe there's a balance between the realms the mods are supposed to maintain. Ending: Perhaps the protagonist succeeds but at a